回到顶部是个常用的js小脚本，我们在平常见到的很多网站上面都有这样的功能,今天我就把之前写的这个实例放到这里，欢迎鉴定使用测试！
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以上就是完成的实例代码，欢迎转载和使用，如果有什么不足和错误之处，希望能够拍砖指出，大家共同交流进步(*^__^*) 嘻嘻！